int comparar ( , )
{
      int i=0, x=0;
      
      while( ( i<n ) && (A.s[i] == B.s[i]) ) {
            if (A.s[i] < B.s[i]){
                  x = -1;
            }
            if (A.s[i] > B.s[i]){
                  x = 1;
            }
            i++;
      }
      return (x);
}



